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From J Chris Anderson <>
Subject Re: Getting reduce overflow error
Date Thu, 17 Jun 2010 17:51:42 GMT

On Jun 17, 2010, at 10:49 AM, afters wrote:
> Is it correct that reductions spread up the b-tree only as high as needed to
> satisfy the group-level demands?

No. Because the group_level isn't known until query time, the index is the same regardless
of how you query it. So all reduce functions should be designed to work properly without grouping.

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